Process for the separation of dicarboxylic acids
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsHeinrich Waldhoff, Joachim Schindler, Holger Viehweg
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Abstract
A process for separation of multicomponent mixtures of dicarboxylic acids, especially, mixtures of C.sub.8 -C.sub.24 saturated and unsaturated acids is derived from a fermentation process, in which an aqueous feed solution containing the mixture of dicarboxylic acids is adjusted in pH value depending on the permeability of the component to be separated and over 95% of the saturated component is separated from the unsaturated material by passing the mixture is content with a membrane filter.
Claims22
A process for the separation of mixtures of dicarboxylic acids which comprises maintaining an aqueous feed solution of a multicomponent mixture of dicarboxylic acids in a membrane filtration zone, adjusting the pH value of said solution such that the membrane is made preferentially impermeable to at least one component of the dicarboxylic acid mixture, and recovering a dicarboxylic acid filtrate containing less of at least one component than said aqueous feed solution.
A process for the separation of mixtures of dicarboxylic acids which comprises maintaining an aqueous feed solution containing a mixture of saturated and unsaturated dicarobxylic acids in a membrane filtration zone, adjusting the pH value of said solution in dependence upon the permeability of the component to be separated, and recovering a filtrate depleted with respect to the saturated carboxylic acid.
A process for the separation of mixtures of dicarboxylic acids which comprises (1) maintaining an aqueous feed solution of mixtures of saturated and unsaturated dicarboxylic acids produced by fermentation in a membrane filtration zone, wherein said membrane is comprised of cellulose esters;
- (2) adjusting the pH of said solution such that the membrane is made preferentially impermeable to at least one component of the dicarboxylic acid mixture;
- and (3) recovering a dicarboxylic acid filtrate containing less of at least one component than said aqueous feed solution.
Dependencies are inferred from the claim text.